Re: -march=pentium2 + -mtune=pentium4 faster then -march=pentium4?

On 3/27/06, Kris Kennaway <kris@xxxxxxxxxxxxxx> wrote:
On Mon, Mar 27, 2006 at 01:05:13PM -0600, Nikolas Britton wrote:
Why does GCC produce faster code using "-march=pentium2
-mtune=pentium4" on a Pentium 4 chip versus plain -march=pentium4?

Try it...

CPUTYPE=pentium2
CFLAGS+= -mtune=pentium4
COPTFLAGS+= -mtune=pentium4

Talk to the gcc developers (and provide benchmarks).


What would be an adequate, proof, benchmark? I've already run several
tests with nbench, testing all of the possible configurations of
-march and -mtune.


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